<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <button id="btn">click</button>
  <script>
    let btn = document.querySelector('#btn');

    function run() {
      console.log('click true')
    }
    btn.addEventListener('click', run)
    btn.removeEventListener('click' , run)
  </script>
</body>
</html>